Add product - Bulk update ($1 product price)

Bulk Update → Add product now supports a fixed unit price in addition to percentage discounts. You can set an exact final price — for example, $1.00 — when adding a product across many subscriptions at once, which is essential for anniversary bottles, milestone gifts, and other token-priced add-ons where compliance rules prohibit $0 alcohol. The fixed price applies uniformly across every subscription in the run and uses your shop's primary currency, with validation to keep entries above zero and at the correct precision.